The Castello Sforzesco is one of the main symbols of Milan and its history. It was built in the fifteenth century by Francesco Sforza became Duke of Milan recently, on the ruins of an earlier fortification dating from the fourteenth century known as Castrum Portae Jovis (Jupiter Castle door or Zobia), and over the centuries has undergone considerable change. Between the sixteenth and seventeenth centuries was a major military citadels in Europe, and almost entirely rebuilt in the historicist style by Luca Beltrami between 1891 and 1905, is now home to important cultural institutions and tourist destination.